Year	% of merchandise exports
1963	15.315590309758106
1964	15.418962258554544
1972	18.371474437343334
1973	21.41168338112415
1974	20.731502616497796
1975	24.762761973040263
1976	22.434166245950593
1983	32.74833248296643
1984	31.36011770620207
2000	18.87932418323806
2002	91.63799267094215
2014	4.044083501390966
2015	87.81106707548496
2016	78.04114959992908
2017	73.34693707432805
2018	45.63968845354914